Help pls!! What additional information is needed to prove that RSTU is a rectangle?

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

y = x + 95

y = 42 + 95

y=137 mm hg

7

step-by-step explanation:

coin flip

non-answer:

choosing

sorry if this isnt what you're looking for i dont really understand the question